Quarterly report pursuant to Section 13 or 15(d)

Debt and Credit Arrangements - Narrative (Details)

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Debt and Credit Arrangements - Narrative (Details) - Citibank, National Association - Revolving Credit Facility
9 Months Ended
Sep. 30, 2021
USD ($)
Line of Credit Facility [Line Items]  
Aggregate secured revolving credit facility $ 150,000,000
Amount outstanding on the Credit Agreement $ 0
Federal Funds Rate  
Line of Credit Facility [Line Items]  
Interest rate 0.50%
LIBOR rate  
Line of Credit Facility [Line Items]  
Interest rate 1.00%
Maximum | LIBOR rate  
Line of Credit Facility [Line Items]  
Interest rate 350.00%
Minimum  
Line of Credit Facility [Line Items]  
Leverage Ratio 3.25
Interest Coverage Ratio 1.75
Minimum | LIBOR rate  
Line of Credit Facility [Line Items]  
Interest rate 225.00%